The double Boost single-phase inverter is an inverter with voltage boosting capability in single power stage

which is suitable for grid-connection of distributed energy. The conventional control strategy cannot achieve good performance of grid current tracking and AC/DC power quality at the same time. Based on the analysis of working principle

power decoupling and resonance mechanism of grid-connected Boost inverter

this paper proposes a grid-connected control strategy with symmetric structure. The control strategy is made up of single current control loop

power decoupling control and active damping control. Moreover

the working principle of each part in the proposed strategy is also analyzed in detail. Finally

the simulation and experiment results show that the proposed strategy not only can achieve fast dynamic response and high-quality grid-connected current

but also can significantly mitigate the second order harmonic component in DC current.